Philinopsis petra (Ev. Marcus, 1976)
    The identification is not confirmed. Philinopsis annae and P. petra are considered cryptic species. Even though Phillinopsis annae can be distinguished from P. petra by some external traits, these differences only become evident in light of molecular data. The main differences between these two species are molecular and internal (shell and reproductive morphology) and therefore not visible in live animals.

Philinopsis petra (Ev. Marcus, 1976)
    Photographed by Linda Ianniello while SCUBA diving near Peanut Island, Palm Beach Inlet, Palm Beach County, Florida, 2/20/2011. Underwater photograph copyright 2011 by Linda Ianniello.